If you don't get regular dental check-ups, you may develop periodontitis.

If you don't have regular dental check-ups, you may develop periodontitis.

The saber-toothed tiger is a type of extinct mammal.

Everyone, please have a good new year.

He admitted that it is difficult to execute the plan, saying 'it is easier said than done.'

She is wearing braces.

He is doing special exercises to strengthen the incisivus labii superioris muscle.

She started a special exercise to strengthen the incisivus labii inferioris muscle.

He is truly a person who embodies the saying, 'A man of virtue will naturally attract admirers.'